new index for key-expiration fields (#142)

Author: alex75

cacholote/alembic/versions/fac14caeb10d_adding_index_key_expiration.py

@@ -0,0 +1,27 @@
+"""adding index key-expiration.
+
+Revision ID: fac14caeb10d
+Revises: a38663d192e5
+Create Date: 2025-03-06 11:43:44.497574
+
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "fac14caeb10d"
+down_revision: Union[str, None] = "a38663d192e5"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_index(
+        "ix_cache_entries_key_expiration", "cache_entries", ["key", "expiration"]
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_cache_entries_key_expiration", "cache_entries")

cacholote/database.py

@@ -49,6 +49,8 @@ class CacheEntry(Base):
     counter = sa.Column(sa.Integer)
     tag = sa.Column(sa.String)
 
+    __table_args__ = (sa.Index("ix_cache_entries_key_expiration", "key", "expiration"),)
+
     @property
     def _result_as_string(self) -> str:
         return json.dumps(self.result)